ImportError: No module named _scproxy

Question

I tried to make Sage from the source but I failed. It seems that the library _scproxy is missing on Yosemite. I haven't found a very helpful aid here on SO and everywhere on the net. If someone can help me. Here is the log :

Found local metadata for setuptools-12.4
Found local sources at /Users/sam/Downloads/sage-6.7/upstream/setuptools-12.4.tar.gz
Checksum: 427e916ad99a704af54b7aa3124bd52d4ebf04d3 vs 427e916ad99a704af54b7aa3124bd52d4ebf04d3
setuptools-12.4
====================================================
Setting up build directory for setuptools-12.4
Finished set up
****************************************************
Host system:
Darwin dhcp-147-65-172-203.impa.br 14.3.0 Darwin Kernel Version 14.3.0: Mon Mar 23 11:59:05 PDT 2015; root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64
****************************************************
C compiler: gcc
C compiler version:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/Users/sam/Downloads/sage-6.7/local/libexec/gcc/x86_64-apple-darwin14.3.0/4.9.2/lto-wrapper
Target: x86_64-apple-darwin14.3.0
Configured with: ../src/configure --prefix=/Users/sam/Downloads/sage-6.7/local --with-local-prefix=/Users/sam/Downloads/sage-6.7/local --with-gmp=/Users/sam/Downloads/sage-6.7/local --with-mpfr=/Users/sam/Downloads/sage-6.7/local --with-mpc=/Users/sam/Downloads/sage-6.7/local --with-system-zlib --disable-multilib --disable-nls --enable-languages=c,c++,fortran --disable-libitm --with-build-config=bootstrap-debug --without-isl --without-cloog  
Thread model: posix
gcc version 4.9.2 (GCC) 
****************************************************
patching file setuptools/command/easy_install.py
Hunk #1 succeeded at 1491 (offset 45 lines).
Hunk #2 succeeded at 1529 with fuzz 1 (offset 45 lines).
Hunk #3 succeeded at 1555 (offset 45 lines).
patching file pkg_resources/__init__.py
Traceback (most recent call last):
  File "setup.py", line 21, in <module>
    exec(init_file.read(), command_ns)
  File "<string>", line 11, in <module>
  File "/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4/src/setuptools/__init__.py", line 11, in <module>
    from setuptools.extension import Extension
  File "/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4/src/setuptools/extension.py", line 8, in <module>
    from .dist import _get_unpatched
  File "/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4/src/setuptools/dist.py", line 16, in <module>
    from setuptools.depends import Require
  File "/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4/src/setuptools/depends.py", line 6, in <module>
    from setuptools import compat
  File "/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4/src/setuptools/compat.py", line 19, in <module>
    from SimpleHTTPServer import SimpleHTTPRequestHandler
  File "/Users/sam/Downloads/sage-6.7/local/lib/python/SimpleHTTPServer.py", line 16, in <module>
    import urllib
  File "/Users/sam/Downloads/sage-6.7/local/lib/python/urllib.py", line 1399, in <module>
    from _scproxy import _get_proxy_settings, _get_proxies
ImportError: No module named _scproxy

real    0m0.113s
user    0m0.059s
sys 0m0.037s
************************************************************************
Error installing package setuptools-12.4
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /Users/sam/Downloads/sage-6.7/logs/pkgs/setuptools-12.4.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4 and type 'make' or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/Users/sam/Downloads/sage-6.7/local/var/tmp/sage/build/setuptools-12.4' && '/Users/sam/Downloads/sage-6.7/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************

EDIT : Ok I don't know what was going on but I restarted for the beginning the building and this seems to work. I don't have any gcc. When i type gcc -v, one answer me that I have clang instead of it ... When i makeit at the first time, the console asked me to rename my directory opt/local because of homebrew. Is think that is what didn't work at the first time. I rename it opt/local during the compilation of sage ...

Answer 1

Probably this is due to a Python build (Sage's Python, that is) that didn't successfully build this module; see this sage-release thread. In principle http://trac.sagemath.org/ticket/17174 should have fixed it (see http://trac.sagemath.org/ticket/17169) but perhaps you are using a non-Sage gcc, such as homebrew? In that event you'll need to either make that change somewhere or perhaps to just use Sage's gcc, which you do with SAGE_INSTALL_GCC=yes (though that will take longer, of course). Good luck!